/************************************************************************
	一行の長さを制限するプログラム	lenlimit
				copyright 2004, TKEN
************************************************************************/
#include <stdio.h>

static int newline_p( int, int );

int
main( int argc, char **argv )
{
	int	i;
	int	limit;
	int	c;
	int	count;
	int	flag;
	int	nc;
	int	ncount;

	char	*tmpbuf;

	if ( argc > 2 ) {
		fprintf( stderr, "Usage:%s [-num]\n", argv[0] );
		exit(1);
	}

	if ( argc == 2 ) {
		limit = atoi( &argv[1][1] );

		if ( limit < 1 ) {
			fprintf( stderr, "wrong number [%s]\n", argv[1] );
			exit(1);
		}
	}
	else {
		limit = 1024;
	}

	tmpbuf = (char *)malloc( limit + 1 );

	if ( tmpbuf == NULL ) {
		fprintf( stderr, "Cannot alloc enough memory\n" );
		exit(1);
	}
		
	count = 0;
	flag = 0;

	while( ( c = fgetc( stdin ) ) != EOF ) {

		nc = fgetc( stdin );
		ungetc( nc, stdin );

		if ( count == limit ) {
			tmpbuf[limit] = '\0';
			printf( "%s\n", tmpbuf );
			count = 0;
			flag = 1;
		}
	
		if ( ( ncount = newline_p( c, nc ) )  != 0 ) {

			if ( flag == 0 ) {
				tmpbuf[count] = '\0';
				printf( "%s\n", tmpbuf );
			}

			for ( i = 0; i < ncount - 1; i++ ) {
				fgetc( stdin );
			}

			flag = 0;
			count = 0;
			continue;
		}

		if ( flag == 0 ) {
			tmpbuf[count] = c;
			count++;
		}
	}

	free( tmpbuf );

	return 0;
}

static
int
newline_p( int c1, int c2 )
{
	if ( ( c1 == 13) && ( c2 == 10 ) ) {
		return 2;
	}

	if ( c1 == 13 ) { 
		return 1;
	}

	if ( c1 == 10 ) { 
		return 1;
	}

	return 0;
}